Brake device



NOV. 25, 1930. H D. HUKILL 1,782,571

BRAKE DEVICE Filed May 9, 1927 3 ae S@ 22 ifa Y 30 30 .imlw

29 INVENTOR HENRY D. HUKILL.

ATTOR NEY Patented Nov. 25, 1930 UNITED -sTA'rEs PATENT oFFlcE may n uumlr.; or rmsnunen, rmsnvuxa. assiduo; 'ro m waarme- HOUSE AIR BRAKE COIPANY, F WILHERDINQ, Pm A GOBPOVB'ATION y or rmmmvmu Application mea nay s,

'i Thisinvention,relatesv to andl more Vparticularly to motor vehicle `brakes and has for an object the rovision of novel means of mounting the laphragm brakechamber and associated parts of the brake. .t

' .Another object of my invention is to provide a unitary construction combinin a, power and -hand brake control with a s ack adjuster. f

These and other ob'ects and advantages will appear from the ollowing description. Referrin to the drawing, in which like reference c aracters refer to like parts, Fig. 1 is a side elevational view of a portion of l5 the brake const-ructed in accordance with the invention, the cam shaft being shown in section; Fig. 2 is a rear elevational view of the same, a portion of the vehicle onwhich the brake is mounted being omitted; Fig. 3 is a sectional view taken on the line 33 of Fig. 2, a portion of the vehiclel to which the brakey is ap lied being shown; and Fig. 4 n is a sectiona view taken on the line 4-4 of Fig. 1. Referring now in detail to the drawing, the reference character 1 indicates a portion of a motor vehicle, which in the present embodiment of the invention is the axle housing, but may be any other suitable part of the vehicle. Secured to the housing 1, there is a bracket member 2 having its lower end portion made in the form of spaced bearings 3 in which a cam shaft 4 is rotatably mounted, one end of said sha-ft being-provided with a cam 5 which, upon rotation of the shaft 4, is ada ted to effect the operation of the usual bra e parts (not shown).

Above the bearing portions 3, the bracket member 2 is-provided' with an outwardly extending pad or projection 6, which is adapted to support a diaphragm brake chamber 7, comprisln casing sections 8 and 9 having a flexible iaphragm 10 clamped between the Aiianges thereof. A fluid pressure sup ly and exhaust pipe 11 is connected to--the c4 amber at one side of the diaphragm 10, and a pressure plate 12 engages the diaphragm at the other side. A -rod 13 is secured,Y to the plate K 12 and extends through a central opening in the casing section 9.

Bunn navires 1927. Serial 110. 189,752.

The casing section 9 has a flange 14 which depends verticall from the clam ing llan and 1s secured to t e projection 6 o the brac et member 2 by bolts 15..or any other suitable securlng means. To strengthen the flange 14 a vertically disposed rib 16 is `provided which is integral with the flange 14 and the body portion of the casing section 9. It will here be noted that the construction of the casing section 9 is such that, by changing the bracket member 2 only, it may be ada. ted, without change, to various` motor ve 'cle constructions. This is an important feature, for the reason that -the construction of .the `diaphragm brake chamber may rbe made standard for any number of types of motor vehicles and may be roperly mounted on these diierenttypes of) vehicles through the medium of the bracket 2, altered to suit the construction ofthe particular ty lof vehicle to which the diaphragm brake c amber is to be applied, thus eliminating many structural diiculties which have heretofore been present.

For the purpose of taking up slack and for operatively connecting the rod 13, and a manually operable brake .rod 18, with the cam shaft 4, a mechanism is provided, comprising a worm wheel 19 which is secured to the cam shaft 4 intermediate the spaced bearing portions 3 of the bracket 2, and has annular collars 20 and 21 projecting `from the sides thereof, upon which .a casing r22 is mounted and adapted to enclose a worm23- on a shaft 24, rotatably mounted at one end in the casing, and adjacent the other end is rotatably mounted in a bushing 25 which has a screw-threaded connection w1th thecasing. The end portion of the shaft 24, which is mounted in the bushing 25, is provided with a pluralit of recesses 26, in an one of which, a ball 2 mounted in the bushing 25, is adapted 4to seat, such ball being forced outwardly at all times by a sp 28. This ball, when seated in any one of e r will prevent accidental rotation of the sha. 24. When it is desired to adjust the brake, the shaft 24 is rotated, by means of a 'wrench `or lever which may engage a nut 29 on the shaft 24; As the shaft is thus rotated the hall 27 will be automatically forced into and Vout of the recesses 26 sov that the locking of the shaft 24 against accidental rotation is entirely automatic. The rotation of the worm 23 causes the worm wheel 19, cam shaft 4, and cam `5 to be rotated relative to the casing 22, thus shifting the angular position of t-he cam relative to the casing, so that the slack, due to the wear of the brake heads and brake drum, will be taken up. A

The casing 22 is providedfwith an integral lever arm which is operatively connected with the outer end of the rod 13, and is also provided with a lever arm 31 disposed at an angle to the arm 30, which arm 31 is operatively connected with one end of the manually operable brake rod 18 by a pin 32, which passes through the arm 31 and slots 33 formed in the end of the rod y18. This connection permits the casing 22 to be operated by fluid under pressure, without operating the manually operable brake rod 18.

For the purpose of holding the cam shaft against accidental .longitudinal movement in one direction, a collar 34 is adjustably secured to the shaft by ajset screw 35, and adapted to engage one ofthe bearing portions 3 of the bracket 2, and to prevent movement in the opposite direction, there is amember 36' secured to the shaft by a bolt 37, and adapted to engage the other of the bearing portions Y 3 of the bracket 2.

One 'side of the casing 22 comprises a bushing 38 which has a screw-threaded connection with the side portion of the casing. This bushing is adapted to close an opening in the casing, which opening is slightly greater in diameter than the diameter of the worm wheel 19 and is adapted to form a bearing for the collar 20 thereof. It will be noted that with this construction the Worm wheel and casing 22 may be assembled preparatory to mounting them between the bearing portions 3 of the bracket 2 and further the shaft 24 and associated parts mayalso be assembled with the casing preparatory to mounting the casing on the cam shaft. It will thus be seen that the combined slack adjuster and brake lever may be assembled and applied to the brake as a unit.

Having nowdescribed my invention, what I claim as new and desire to secure by Letters of a' bracket for supporting said shaft,l a worm'wheel secured to said shaft, collars projecting) from the sides of said worm wheel, a mem er mounted on said collars and enclos;- ing said worm wheel, a rotatable worm mounted in said member and meshing with said worm wheel, and forming 'an' operal tive connection between said shaft and member, and a plurality of lever arms integral with said member through which said member is adapted to be operated to rotate said shaft.

3. In a motor vehicle brake, the combination with a rotatable brake applying shaft, of a bracket for supporting said shaft, a w'orm wheel secured to said shaft, collars projecting from the sides of said worm wheel, a member mounted on said collars and enclosing said worm wheel, a rotatable worm mounted in-said member and meshing with said worm wheel, and forming an operative connection between said shaft and member, a plurality of lever arms integral with said member, fluid pressure means connected with one of said lever arms and operative to r0- tate said shaft to apply the brakes, and manually operable means connected with the other of said lever arms to rotate the shaft and apply the brakes.

4. In a motor vehicle brake, the combination with .a rotatable brake applying shaft,

of a manually operable'brake rod,a Huid presv sure operated rod, a member operatively connecting both of said rods with said shaft, means associated with said member for adjusting the angular position ofsaid shaft relative to said member, and means operable automatically for maintaining the adjustment of said shaft.

In testimony whereof I have hereunto set my hand. v

BENRY D. HUKILL.

.1. In a motorvehicle brake, the combinasaid member and meshing with said worm wheel, and a lever arm through which said member is operated to rotate said shaft.

2. In a motor vehicle brake, the combination with a rotatable brake applying shaft,

lll 

